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Message-ID: <4C2A25F2.1050703@mvista.com>
Date: Tue, 29 Jun 2010 06:57:22 -1000
From: akuster <akuster@...sta.com>
To: oss-security@...ts.openwall.com
CC: Eugene Teo <eugeneteo@...nel.sg>,
"Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request - kernel: cifs: Fix a kernel BUG with
remote OS/2 server
pSMBr->CountHigh looks to have been introduce by commit
381a420f5b23cedd9e166e052a93a7f4237bd57c back in 2.6.12-rc2.
So would it be said this issue has been around since then?
- Armin
On 06/27/2010 10:41 PM, Eugene Teo wrote:
> "This was known to trigger with a OS/2 server. The server sets
> pSMBr->CountHigh to a incorrect value even in case of normal writes.
> This results in 'nbytes' being computed wrongly and triggers a kernel
> BUG at mm/filemap.c.
>
> void iov_iter_advance(struct iov_iter *i, size_t bytes)
> {
> BUG_ON(i->count < bytes); <--- BUG here
>
> Why the server is setting 'CountHigh' is not clear but only does so
> after writing 64k bytes. Though this looks like the server bug, the
> client side crash may not be acceptable.
>
> The workaround is to mask off high 16 bits if the number of bytes
> written as returned by the server is greater than the bytes requested by
> the client."
>
> https://bugzilla.redhat.com/show_bug.cgi?id=608583
> http://git.kernel.org/linus/6513a81e9325d712f1bfb9a1d7b750134e49ff18
>
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